Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a95e4d919c86f62…

MALICIOUS

PDF

71.0 KB Created: 2021-02-21 09:57:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5a4cc17957c2a031cbe5c9263c325712 SHA-1: d4223570270e30b8c8d5927e031d93ab60f8861f SHA-256: 3a95e4d919c86f6210bbf9a1ec71acbddcb4a661ac78f98d6e669713cdb80e1d
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file is identified as malicious by multiple heuristics and an ML classifier, including a critical alert for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to product pricing, which is consistent with phishing or malware distribution. The embedded URLs, particularly the one pointing to 'crophysi.ru', are highly suspicious and likely serve to redirect the user to a malicious site or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crophysi.ru/strik?utm_term=troy+bilt+tb230+price In PDF document text
    • https://static.s123-cdn-static.com/uploads/4469105/normal_5fc68ac4eb3d3.pdfIn PDF document text
    • https://fusajowaxoxa.weebly.com/uploads/1/3/5/3/135344195/nuneresituler-gamemigamovetaw-pepadez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501208/normal_5fef50bfe5940.pdfIn PDF document text
    • https://defosojuregoko.weebly.com/uploads/1/3/1/3/131383900/555771.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419195/normal_5ff5585dc4908.pdfIn PDF document text
    • http://roskycnmx.com/is_disney_california_adventure_busy_todaymlsob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420907/normal_6009eb4282581.pdfIn PDF document text
    • https://zibinileder.weebly.com/uploads/1/3/4/7/134748255/deripes_vevodenugenowax_misamanive.pdfIn PDF document text
    • http://teplotronic.ru/81635847332c7w5j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487424/normal_600651382641f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392199/normal_6026cdee3e2fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365552/normal_5ff52b91bd5ea.pdfIn PDF document text
    • https://jawimuxuketeg.weebly.com/uploads/1/3/4/7/134763527/dolagoteb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/73367521665.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/23199627034.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/93421354643.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/chess_analyze_apk_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/cutting_edge_pre-_intermediate_tests_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/bapezutejixewigasoz.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD632 5168 bytes
SHA-256: 737edf644853c1f6e7b01f37231f8ee86a944d39092d321b9e955fcdf4cc48a0
font_01_sfnt_off0000e7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E4 11924 bytes
SHA-256: 5b56af78d369e7baa0e6199224f4dc4237205c03bda43918458b9ce827ae522f

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